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Functions and Examples
Issue 4 September 1995
8-9
The following is an example of an inflow vector that might be used by a receiving
switch:
Figure 8-3. Receiving Switch Inflow Vector
Step 1 of this inflow vector checks the inflow thresholds. The
goto step
command
in Step 1 checks the number of queued calls in split 1. If the number of such calls
is greater than 5, a branch is made to the
busy
command in Step 6. If executed,
the
busy
command denies the call, and the receiving switch returns a call denial
message to the sending switch. The sending switch, in turn, drops the Look-
Ahead Interflow call attempt and then continues vector processing at the next
vector step.
On the other hand, if the number of queued calls in split 1 is less than or equal to
5, the receiving switch returns a call acceptance message to the sending switch,
and call control is passed to the receiving switch. Thereafter, the call is queued
to split 1 in the receiving switch (Step 2). Once queued, the caller receives the
appropriate announcement in Step 3 and is then provided with music until the
call is answered by an agent or abandoned by the caller (Steps 4 and 5).
(Remember, the
stop
command halts vector processing but does not drop the
call.)
NOTE:
If the sending switch does not receive a call acceptance or call denial
message within 120 seconds (G3 switches) or 10 seconds (G2 or network
switches) after the Look-Ahead Interflow call request, the Look-Ahead
Interflow attempt is dropped, and the sending switch continues vector
processing at the next step.
Tandem Switch Configuration
Tandem Look-Ahead Interflow is implemented by using
route-to
commands that
contain external destinations that route over ISDN-PRI facilities. This
configuration is illustrated as follows:
1. goto step 6 if calls-queued in split 1 pri h > 5
2. queue-to main split 1 pri h
3. announcement 4000
4. wait-time 2 seconds hearing music
5. stop
6. busy